A101794 Numbers n such that 4n-1, 8n-1, 16n-1 and 32n-1 are primes.

45, 90, 675, 885, 3030, 4290, 6870, 13410, 14460, 15855, 17850, 18675, 20625, 21885, 25350, 26820, 26925, 28230, 30525, 30705, 31710, 31785, 33375, 34860, 41685, 41940, 57435, 63420, 63570, 71805, 74025, 78585, 83865, 85230, 93075

Offset

1,1

Links

Table of n, a(n) for n=1..35.

Example

4*45-1=179, 8*45-1=359, 16*45-1=719 and 32*45-1=1439 are primes, so the first entry is 45.

Crossrefs

Cf. A002515, A101795, A101796, A101797, A101798.

Sequence in context: A184540 A115827 A070002 * A124017 A121925 A044183

Adjacent sequences: A101791 A101792 A101793 * A101795 A101796 A101797

Keyword

easy,nonn

Author

Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 16 2004

Status

approved